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        <title>AJ Utils-BoxLogger Tutorial</title>
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                <h1>
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                    AJ Utils
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                <h3>Small Java Utils Library</h3>
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                <h3>Common</h3>
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                    <li><a href="/common/JsonUtil/">JsonUtil</a></li>
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                <h1>BoxLogger Tutorial</h1>
<p>This tutorial provides an overview of the <code>BoxLogger</code> class, which is part of the <code>lightweight-component/aj-util</code> library. The <code>BoxLogger</code> class provides utilities for creating boxed log messages with proper formatting and alignment.</p>
<h2>Introduction</h2>
<p>The <code>BoxLogger</code> class contains static methods for creating visually formatted log messages in boxes, with support for ANSI colors and proper handling of wide characters (like CJK).</p>
<h2>Main Features</h2>
<ul>
<li>Boxed log message formatting</li>
<li>ANSI color support</li>
<li>String truncation with ellipsis</li>
<li>Display width calculation (handling wide characters)</li>
<li>String repetition utility</li>
</ul>
<h2>Constants</h2>
<ol>
<li><code>ANSI_GREEN</code> - ANSI green color code</li>
<li><code>ANSI_YELLOW</code> - ANSI yellow color code</li>
<li><code>ANSI_BLUE</code> - ANSI blue color code</li>
<li><code>ANSI_RED</code> - ANSI red color code</li>
<li><code>ANSI_RESET</code> - ANSI reset code</li>
<li><code>NONE</code> - Constant &quot;none&quot;</li>
<li><code>TRACE_KEY</code> - Default trace key name</li>
<li><code>BIZ_ACTION</code> - Default business action key name</li>
</ol>
<h2>Methods</h2>
<h3>1. Box Formatting</h3>
<ol>
<li><code>boxLine(char left, char fill, char right, String title)</code> - Create a box border line</li>
<li><code>boxContent(String key, String value)</code> - Create a content line within box</li>
</ol>
<h3>2. String Utilities</h3>
<ol>
<li><code>repeat(char c, int n)</code> - Repeat character n times</li>
<li><code>truncate(String s, int maxDisplayLen)</code> - Truncate string with ellipsis</li>
<li><code>getDisplayWidth(String s)</code> - Calculate display width (wide chars = 2)</li>
<li><code>isWideChar(char ch)</code> - Check if character is wide (CJK)</li>
</ol>
<h2>Usage Examples</h2>
<h3>Create Boxed Log</h3>
<pre><code class="language-java">System.out.println(BoxLogger.boxLine('┌', '─', '┐', &quot; LOG START &quot;));
System.out.println(BoxLogger.boxContent(&quot;User: &quot;, &quot;张三&quot;));
System.out.println(BoxLogger.boxLine('└', '─', '┘', &quot; LOG END &quot;));
</code></pre>
<h3>ANSI Colors</h3>
<pre><code class="language-java">System.out.println(BoxLogger.ANSI_RED + &quot;Error!&quot; + BoxLogger.ANSI_RESET);
</code></pre>
<h3>String Utilities</h3>
<pre><code class="language-java">String repeated = BoxLogger.repeat('-', 10); // &quot;----------&quot;
String truncated = BoxLogger.truncate(&quot;This is a long string&quot;, 10); // &quot;This is...&quot;
int width = BoxLogger.getDisplayWidth(&quot;中文&quot;); // 4
</code></pre>
<h2>Implementation Notes</h2>
<ul>
<li>Box width is fixed at 97 characters</li>
<li>Properly handles CJK and fullwidth characters</li>
<li>Includes basic ANSI color support</li>
<li>Provides clean truncation with ellipsis</li>
</ul>
<h2>Conclusion</h2>
<p>The <code>BoxLogger</code> class provides useful utilities for creating visually formatted log messages, especially useful for CLI applications or debugging output.</p>

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